Mobile wireless data communications system

ABSTRACT

In order for the user to perform a transmission of packet data to a desired communication counterpart on a virtual network across a wireless circuit exchange type network system and a LAN without being bothered by address exchange between an address of a physical network and an address of a virtual network, an exchange (10a) performs an address exchange necessary for establishing a communication channel between the terminal equipments within the system using a conversion table, in a mobile wireless data communication system in which a wireless circuit type network system comprising a wireless mobile station (30a), a wireless connection equipment (20a) and the exchange (10a) is connected to a LAN (40a) through a TA (60a) and a router (50a).

TECHNICAL FIELD

This invention relates to a mobile wireless data communications systemcapable of transmitting packet data between the data communicationterminal equipments in a virtual network across a mobile communicationsnetwork and a LAN.

TECHNICAL BACKGROUND

The progress of a recent wireless technology is remarkable. Even if itis limited to a private usage, the technology for making the indoortelephone fully wireless became a reality with the use of a PBX privatebranch exchange) system, etc., based on the technique for personalcommunications which is a result of the development of cordlesstelephones. Moreover, a wireless LAN (local area network) is widelypracticed also in the field of data communications. This LAN undertakesa role for making offices and the like wireless.

In the wireless PBX, mobility, as well as wireless of telephones, waspursued. That is, a movement in the wireless area under the control of asingle PBX is made possible as a matter of course, and in addition, evena movement across between PBX is also made possible by the automaticposition registration, without compelling the user a uselessregistration change (or, transmitting an incoming signal, etc.). Thistechnology is often referred to as "loaming between PBX". In principle,it realizes a possibility of endless movement even within the privatebranch. Moreover, a PBX added-service based on the use of the PBX whichmostly uses the voice is realized in an almost perfect shape with therealization of this mobility.

On the other hand, recently, needs to a telephoneless communication asrepresented by e-mail have been increasing. This telephonelesscommunication method includes a method for performing a communicationthrough a telephone line (channel exchange) and a method for performinga communication from a terminal equipment accommodated within the LAN.Needless to say, the method using the LAN is chiefly employed in recentoffices. In addition, the appearance of the Internet is spurring thepopularization of this LAN further. Now, the technology of the Internetis briefly described.

The Internet is one embodied form of a virtual network which aims atperforming worldwide communications across the various physical networksrepresented by LAN such as Ethernet, essentially satisfying thefollowing items.

(a) The network principle of the Internet is to realize a virtualnetwork and not to specify a form of realization of a physical network.

(b) The Internet address does not obligate the existence of a switchingnode which performs the switching intensively. On the other hand, it isnecessary for the terminal equipment to be fixed to the physicalnetwork.

In order to perform a routing between the terminal equipments across thevarious physical networks, it is necessary that the terminal equipmentsare uniquely identified in the world. Concretely, it is necessary that aconnection point with the physical network where the specific terminalequipment is accommodated is uniquely identified in the world. In theInternet, therefore, an address called "IP (Internet Protocol) address"is assigned to each terminal equipment based on a common system in theworld, and the routing is performed based on this Internet Protocoladdress.

The wireless PBX chiefly comprising the channel exchange and theInternet based on the LAN were explained hereinbefore. The former isbecoming main communication means in offices by adding mobility thereto,and the latter is becoming main communication means for datacommunications. It seams that importance of those communication meanswill rise more and more as a basic structure for supporting activitiesin offices in the future.

By the way, in the virtual network across the wireless PBX and the LAN,the data communication terminal equipment, which is under the control ofthe wireless PBX, occasionally transmits packet data. In such occasions,a communication channel in the wireless PBX system was established bysignal outputted from the telephone (personal station) connected to thedata communication terminal equipment, and a data communication wasperformed via the LAN. That is, the role to make the address on thevirtual network and the address (in this case, telephone number) on thephysical network correspond to each other was played by man as anaddresser of the data. Therefore, the operation was troublesome.

DISCLOSURE OF INVENTION

This invention was accomplished in view of the above-mentionedcircumstances. It is, therefore, an object of the present invention toprovide a mobile wireless data communications system, in which anaddress system of a physical network and an address system on a virtualnetwork are made correspond to each other so that a routing of packetdata is automatically performed to thereby transmit data in a datacommunication on a virtual network across a wireless line exchange typenetwork system and a LAN.

In order to achieve this object, a mobile wireless data communicationssystem according to the present invention comprises a wireless personalstation assigned with a telephone number in accordance with a singletelephone number scheme, a wireless connection equipment for performinga wireless connection with the wireless personal station, an exchangefor controlling the wireless connection equipment, a control unitconnected to the exchange and adapted to perform a transmission controlof packet data through the LAN, and a terminal equipment connected tothe LAN and assigned with a packet address independent of the telephonenumber scheme, the exchange performing a routing based on the telephonenumber, the control unit performing a transmission control of the packetdata based on the packet address, characterized in that the exchange hasa correspondence table in which the packet address is made correspond tothe telephone number, and the packet address is converted to thetelephone number based on the correspondence table in order to establisha communication channel between the wireless personal station and theterminal equipment connected to the LAN.

According to the present invention, since the address on the physicalnetwork and the address on the virtual network are automaticallyconverted to each other on the virtual network across the wireless lineexchange type network system and the LAN, a packet data can betransmitted to a desired communication counterpart without being annoyedby such address conversion.

In such a configuration as mentioned above, instead of making theexchange have a correspondence table, the wireless personal station mayhave a correspondence table in which the packet address is madecorrespond to the telephone number, and may convert the packet addressto the telephone number based on the correspondence table in order toestablish a communication channel between the wireless personal stationand the terminal equipment connected to the LAN.

Also, instead of making the exchange have a correspondence table, thecontrol unit may have a correspondence table in which the packet addressis made correspond to the telephone number, and may convert the packetaddress to the telephone number based on the correspondence table inorder to establish a communication channel between the wireless personalstation and the terminal equipment connected to the LAN.

Next, in order to achieve the above object, a mobile wireless datacommunications system according to the present invention comprises aplurality of systems each comprising a wireless personal stationassigned with a telephone number in accordance with a single telephonenumber scheme, a wireless connection equipment for performing a wirelessconnection with the wireless personal station, an exchange forcontrolling the wireless connection equipment, a control unit connectedto the exchange and adapted to perform a transmission control of packetdata through the LAN, and a terminal equipment connected to the LAN andassigned with a packet address independent of the telephone numberscheme, the exchange performing a routing based on the telephone number,the control unit performing a transmission control of the packet databased on the packet address, characterized in that the exchanges of thesystems are connected together and the control units of the systems arealso connected together, the wireless personal station of each system iscapable of communicating with a control unit in a desired system througha wireless connection equipment and an exchange not only within its ownsystem but also within other system, the exchange has a correspondencetable in which the packet address is made correspond to the telephonenumber, and the packet address is converted to the telephone numberbased on the correspondence table in order to establish a communicationchannel between the wireless personal station and the terminal equipmentconnected to the LAN.

In such a configuration as mentioned above, instead of making theexchange have a correspondence table, the wireless personal station mayhave a correspondence table in which the packet address is madecorrespond to the telephone number, and may convert the packet addressto the telephone number based on the correspondence table in order toestablish a communication channel between the wireless personal stationand the terminal equipment connected to the LAN.

Also, instead of making the exchange have a correspondence table, thecontrol unit may have a correspondence table in which the packet addressis made correspond to the telephone number, and may convert the packetaddress to the telephone number based on the correspondence table inorder to establish a communication channel between the wireless personalstation and the terminal equipment connected to the LAN.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram showing a configuration of the first embodiment ofthe present invention.

FIG. 2 is a connection sequence diagram showing the operation of theabove embodiment.

FIG. 3 is a connection sequence diagram showing the operation of theabove embodiment.

FIG. 4 is a connection sequence diagram showing the operation of theabove embodiment.

FIG. 5 is a connection sequence diagram showing the operation of theabove embodiment.

FIG. 6 is a diagram showing a configuration of the second embodiment ofthe present invention.

FIG. 7 is a connection sequence diagram showing the operation of theembodiment of FIG. 6.

FIG. 8 is a connection sequence diagram showing the operation of theembodiment of FIG. 6.

FIG. 9 is a connection sequence diagram showing the operation of theembodiment of FIG. 6.

FIG. 10 is a connection sequence diagram showing the operation of theembodiment of FIG. 6.

FIG. 11 is a diagram showing a configuration of the third embodiment ofthe present invention.

FIG. 12 is a connection sequence diagram showing the operation of theembodiment of FIG. 11.

FIG. 13 is a connection sequence diagram showing the operation of theembodiment of FIG. 11.

FIG. 14 is a connection sequence diagram showing the operation of theembodiment of FIG. 11.

FIG. 15 is a connection sequence diagram showing the operation of theembodiment of FIG. 11.

FIG. 16 is a connection sequence diagram showing the operation of theembodiment of FIG. 11.

BEST MODE FOR CARRYING OUT THE INVENTION

The best mode for carrying out the present invention will now bedescribed in detail.

1: First Embodiment

First of all, the first embodiment of the present invention isdescribed. In this embodiment, the present invention is applied to anin-house communications system having a wireless PBX system and a LANconnected to the wireless PBX system and in which a routing is performedusing the IP as a communication protocol.

1-1: Configuration of First Embodiment

A configuration of the first embodiment is illustrated in FIG. 1. Asshown in this Figure, the wireless PBX system among many in-housecommunication systems comprises a PBX, a CS (Cell Station), and a PS(Personal Station). In the configuration of FIG. 1, reference numerals10a and 10b denote the PBX; 20a and 20b, the CS; and 30a and 30b, thePS, respectively.

Here, the PBX 10a and 10b each comprise a control portion, a switchingportion, a base band processing portion, a memory for storing initialregistration data of the PS which is under the control of the PBX 10a,10b, and some others. The PBX 10a and 10b have the functions forcontrolling the overall system, exchanging the channel of data flowingon the communication channel, coding voices, exchanging the channelwhile a communication is going on, verifying the PS, registering thelocation of the PS, loaming for a communication which the PS performswhile moving between different PBX.

In case the PBS where the initial registration data of the PS arepresent is assumed to be a home PBX (H-PBX) of its PS and the PBX of itsnext visiting place is assumed to be a visitor PBX (V-PBX), a loaming isperformed by connecting the call with reference to the locationregistration data of the PS stored in the memory of the H-PBX when dataare sent to or received by the PS which is currently present in thewireless area of the V-PBX. In the example of FIG. 1, the PBX 10a is theH-PBX and the PBX 10b is the V-PBX both for the PS 30a. HM denotes ahome memory within the H-PBX which stores therein the locationregistration data. In order to send and receive the control datanecessary for loaming, the PBX are connected together by ISDN(Integrated Services Digital Network) multiplexed by TDM (Time DivisionMultiple access) or a private channel.

The CS 20a and 20b each comprise a wireless portion (modulation anddemodulation portion), and a pair of PBX interface portions. The CS 20aand 20b are connected respectively to the PBX through a wired specialpurpose interface, and transmit control signal and data between the PBXand the PS through a wireless section (radio section).

The PS 30a and 30b each comprise a wireless portion (modulation anddemodulation portion), a base band processing portion, an externalterminal equipment interface portion, etc. The PS 30a and 30b perform asending/receiving of signal, voice-coding, etc. for voice and datacommunications. In case the data communication is performed, the PS 30aand 30b are connected to DTE (Data Terminal Equipment) having a serialinterface such as RS232C to transmit a control signal, data, etc. fromthe DTE through the wireless section.

LAN 40a and 40b use the Ethernet as a physical medium, comprisingsub-networks which are divided by routers 50a and 50b for performing arouting of IC packets. The LAN 40a and 40b may use other medium than theEthernet. Each sub-network is connected to the PBX 10a or 10b within thewireless PBX system through the router 50a or 50b and a TA (TerminalAdapter) 60a or 60b. The TA 60a and 60b each comprise a protocolconversion portion, an interface portion, and the like. The TA 60a and60b are connected together through the PBX, ISDN or a special purposeinterface. The TA 60a and 60b perform the sending and receiving ofsignal and the terminating of protocol. The routers and the TA have therole which a control unit has, for controlling the transmission ofpacket data through the LAN.

In this embodiment, a communication can be performed between one DTE onthe LAN side and other DTE on the wireless PBX system side. In theexample of FIG. 1, the LAN 40a is connected with a DTE 41a, and M-DTE(Mobile Data Terminal Equipment) 32a and 32b are present on the wirelessBPX system side.

The M-DTE and DTE each include a personal computer, so-called PDA(Personal Digital Assistant), and the like. They serve as acommunication protocol for supporting TCP/IP (Transmission ControlProtocol/Internet Protocol). The M-DTE 32a and 32b are connectedrespectively to ADP (Adapters) 31a and 31b through a serial interface,and the ADP 31a and 31b are connected respectively to the PS 30a and 30bthrough a serial interface. The ADP 31a and 31b each comprise a protocolconversion portion, an interface portion, and the like. The ADP 31a and31b perform the terminating of the protocol. The M-DTE, ADP and PS maybe designed such that they are theoretically separate but physicallyintegral.

In order to perform a data communication between the M-DTE and the DTEor M-DTE, it is necessary to make an address (IP address) used in an IPlayer correspond to an address (Ethernet address in the LAN, andextension number in the wireless PBX system) used in a lower physicallayer than the IP layer. In general, the LAN is a connectionless typenetwork, in which a node (in general, a router) for relaying an IPpackage exchanges the IP address for the Ethernet address, and performsa relay transmission of the IP packet.

On the other hand, the wireless PBX system is a connection type networkwhich establishes an end-to-end physical link through the PBX andperforms a communication by channel exchange. Here, in case the IPaddress is not identical with the physical address, it is necessary toprepare a table (conversion table) for making the former correspond tothe latter. With the use of the conversion table, a physical link isestablished and the IP packet is transmitted on it. In this embodiment,a conversion table 70 for performing this conversion function isprovided on the H-PBX.

1-2: Operation of First Embodiment

Operation of this embodiment will now be described.

1-2-1: In Case Communication Is Performed Between M-DTE and DTE Underthe Control of H-PBX

A connection procedure for sending data from a certain M-DTE to a DTEwithin the LAN is described first with reference to a connectionsequence diagram of FIG. 2.

In the first step, the M-DTE sends a communication start request to thePS. At that time, the M-DTE simultaneously notifies the PS of anincoming IP address indicative of a DTE as the addressee. Recognizingthat the call is for the data communication, the PS sends a connectionrequest designating an IP/extension number conversion connection specialnumber (special number) requesting a conversion from the IP to anextension number to the H-PBX. At that time, the above connectionrequest includes the incoming IP address so that the request can bedistinguished from a connection request for voice communication.

Receiving the special number for IP/extension number conversionconnection from the PS and recognizing it as a call for datacommunication, the H-PBX converts the incoming IP address included inthe connection request to an extension number using the conversion tableand sends a connection request to the TA corresponding to this extensionnumber. In this case, the H-PBX may send the connection request directlyand unconditionally to the TA without referring to the incoming IPaddress information contained in the conversion table.

In response to the connection request from the H-PBX, the TA sends aconnection acknowledgment and establishes a communication channelbetween the PS and the TA through the H-PBX. Thereafter, the M-DTEcommunicates with the DTE through the router connected to the LAN.

1-2-2: In Case One M-DTE Sends Data to Other M-DTE

With reference to FIG. 3, a connection procedure for the M-DTE 1 underthe control of the H-PBX to communicate with other M-DTE is describedfirst.

In the first step, the M-DTE 1 sends a communication start request tothe PS 1. At that time, the M-DTE 1 simultaneously notifies the PS 1 ofan incoming IP address indicative of a M-DTE 2 as the addressee.Recognizing that the call is for data communication, the PS 1 sends aconnection request designating an IP/extension number conversionconnection special number (special number) requesting a conversion fromthe IP to an extension number to the H-PBX.

Receiving the special number for the IP/extension number conversionconnection from the PS 1 and recognizing it as a call for datacommunication, the H-PBX converts the incoming IP address included inthe connection request to an extension number using the conversiontable. Finishing the conversion to the extension number, the H-PBXaccesses a home memory HM within the H-PBX which stores the locationregistration data and confirms which PBX the PS, for example, PS 2 asthe addressee corresponding to the specific extension number is underthe control of. Confirming that the PS 2 is under the control of theH-PBX, the H-PBX sends a connection request to the PS 2. Thereafter, aconnection acknowledgment from the PS 2 as the addressee is sent to thePS 1 as the addresser. As a consequence, a communication channel isestablished between the PS 1 and the PS 2 through the H-PBX and acommunication is performed between the M-DTE 1 and M-DTE 2.

The connection procedure described above is used for the case where boththe PS 1 and PS 2 are under the control of the same PBX (H-PBX in theabove example). In case the PS 2 as the addressee for the PS 1 is underthe control of other PBX, namely, V-PBX than the H-PBX, the loamingfunction is used. A connection sequence for that occasion is shown inFIG. 4. In this case, in addition to the connection sequence of FIG. 3,a procedure for establishing a communication channel between the H-PBXand the V-PBX through a multiplex channel is needed.

More specifically, in this case, after receiving a connection requestfrom the PS 1 and finishing the conversion of the incoming IP address toan extension number, the H-PBX accesses the home memory HM and confirmsthat the PS (PS 2) corresponding to the extension number is under thecontrol of other PBX, namely V-PBX. As a consequence, control data aresent and received between the H-PBX and V-PBX through a multiplexchannel, and a communication channel is established between the PS 1 andPS 2. This makes it possible for the PS 1 to communicate also with thePS 2 as a different PBX from the H-PBX which is under its own control.

1-2-3: In Case Data are Sent From DTE to M-DTE

With reference to a connection sequence diagram of FIG. 5, a connectionprocedure for sending data from the DTE to the M-DTE is described next.

When the router connected to the H-PBX through the TA receives an IPpacket from the DTE to be addressed to the M-DTE, it sends a request tothe TA requesting the TA to send the IP packet to the special number ofthe H-PBX, judging that the addressee of the packet is the H-PBX. Atthat time, an incoming IP address corresponding to the M-DTE as theaddressee is simultaneously informed. In response to the request fromthe router, the TA sends a connection request designating anIP/extension number conversion connection special number (specialnumber) of the H-PBX. At that time, an incoming IP address is includedin the connection request.

Receiving the connection request from the TA with the special number andrecognizing it as a call for data communication, the H-PBX converts theincoming IP address included in the connection request to itscorresponding extension number using the conversion table. Then, theH-PBX accesses the home memory HM and confirms which PBX the PScorresponding to the specific extension number is under the control of.Confirming that the PS is under the control of the H-PBX, the H-PBXsends a connection request to the PS as the addressee. The PS as theaddressee sends a connection acknowledgment in response to theconnection request from the H-PBX. As a consequence, a communicationchannel is established between the PS and the TA through the PBX.Thereafter, the DTE communicates with the M-DTE through the routerconnected to the LAN.

In case the PS as the addressee is under the control of the V-PBX, acommunication channel is established between the H-PBX and the V-PBXthrough a multiplex channel, using the loaming function. This makes itpossible for the DTE to communicate also with the PS which is under thecontrol of other V-PBX than the H-PBX which is under its own control.

2: Second Embodiment

Next, the second embodiment of the present invention is described.

2-1: Configuration of Second Embodiment

FIG. 6 illustrates a configuration of this second embodiment. Thisembodiment is different from the first embodiment only in the respectthat the conversion tables for converting the IP address of theaddressee to a physical address (extension number) are each provided oneach PS 30a, 30b.

2-2: Operation of Second Embodiment

Operation of this embodiment will now be described.

2-2-1: In Case Data are Sent from M-DTE to DTE

A connection procedure for sending data from a certain M-DTE to a DTEwithin the LAN is described first with reference to a connectionsequence diagram of FIG. 7. This procedure is different from that of thefirst embodiment only in the respect that the address conversion tableis provided on the PS. The PS converts the incoming IP address to acorresponding extension number using the conversion table and sends aconnection request including the extension number as in the case with avoice communication (in this case, no incoming address data may becontained in the conversion table and a connection request including theextension number of the TA may be set unconditionally). The H-PBXreceives a connection request from the PS and sends it to the TA. Inresponse to the connection request from the H-PBX, the TA sends aconnection acknowledgment and establishes a communication channelbetween the PS and the TA through the H-PBX. Thereafter, the M-DTEcommunicates with the DTE through the router connected to the LAN.

2-2-2: In Case One M-DTE Sends Data to Other M-DTE

With reference to FIG. 8, a connection procedure for sending data fromone M-DTE to other M-DTE is described next. In this case, after theincoming IP address is converted to an extension number at the PS, theH-PBX accesses a home memory HM within the H-PBX which stores thelocation registration data and sends a connection request to the PS asthe addressee. Thereafter, a connection acknowledgment from the PS asthe addressee is sent to the PS as the addresser. As a consequence, acommunication channel is established between the PS as the addressee andthe PS as the addresser through the PBX. Thereafter, a communication isperformed between the first M-DTE and the second M-DTE.

In case the PS as the addressee is under the control of the V-PBX, theloaming function is used in accordance with a connection sequence ofFIG. 9, so that a communication channel is established between the H-PBXand the V-PBX through a multiplex channel.

2-2-3: In Case Data are Sent From DTE to M-DTE

With reference to a connection sequence diagram of FIG. 10, a connectionprocedure for sending data from the DTE to the M-DTE is described next.This procedure is different from that of the first embodiment only inthe respect that the H-PBX has no conversion table. For this reason, anincoming notification with the use of the incoming IP address is sentfrom the H-PBX. Upon receipt of the incoming notification, the PS sendsan acknowledgment when the incoming IP address therein is in agreementwith the IP address of the connected M-DTE and establishes acommunication channel between the PS and the TA through the PBX.Thereafter, the DTE communicates with the M-DTE through the routerconnected to the LAN. In case the PS as the addressee is under thecontrol of the V-PBX, a communication channel is established between theH-PBX and the V-PBX through a multiplex channel, using the loamingfunction.

3: Third Embodiment

Next, the third embodiment of the present invention is described.

3-1: Configuration of Third Embodiment

FIG. 11 illustrates a configuration of the third embodiment. Thisembodiment is different from the first embodiment only in the respectthat a conversion table for converting the IP address of the addresseeto a physical address (extension number) is provided on a router 50a.

3-2: Operation of Third Embodiment

Operation of this embodiment will now be described.

3-2-1: In Case Data are Sent from M-DTE to DTE

A connection procedure for sending data from a certain M-DTE to a DTEwithin the LAN is described with reference to a connection sequencediagram of FIG. 12. This procedure is different from that of the firstembodiment only in the respect that the router (H-router) has theaddress conversion table. The incoming IP address is converted to acorresponding extension number using this conversion table. Further, thedata of the extension number corresponding to the incoming IP address ofthe DTE at that time do not exist on the conversion table. Recognizingthat the call is for data communication, the PS sends a connectionrequest designating the IP/extension number conversion connectionspecial number (special number) of the H-PBX as the addressee. At thattime, the connection request includes the incoming IP address, so thatthis request can be distinguished from a connection request for voicecommunication. The H-PBX receives a connection request from the PS withthe special number and sends it to the TA when the H-PBX recognizes itas a call for data communication. At that time, the connection requestincludes the incoming IP address. In response to the connection requestfrom the H-PBX, the TA searches the conversion table within the H-routerand judges that the specific DTE exists on the LAN because no data ofthe incoming IP address are found. Then, the TA sends a connectionacknowledgment to the H-PBX and establishes a communication channelbetween the PS and the TA through the PBX. Thereafter, the M-DTEcommunicates with the DTE through the router connected to the LAN.

3-2-2: In Case Data are Sent from One M-DTE to Other M-DTE

With reference to FIG. 13, a connection procedure for sending data fromone M-DTE to other M-DTE is described next. In this case, after theincoming IP address is converted to an extension number at the PS, theH-PBX accesses a home memory HM within the H-PBX which stores thelocation registration data and sends a connection request to the PS asthe addressee. Thereafter, a connection acknowledgment from the PS asthe addressee is sent to the PS as the addresser. As a consequence, acommunication channel is established between the PS as the addressee andthe PS as the addresser through the PBX. Thereafter, a communication isperformed between the first M-DTE and the second M-DTE. In case the PSas the addressee is under the control of the V-PBX, the loaming functionis used, so that a communication channel is established between theH-PBX and the V-PBX through a multiplex channel in accordance with aconnection sequence of FIG. 14.

3-2-3: In Case Data are Sent From DTE to M-DTE Under Control of H-PBX

With reference to a connection sequence diagram of FIG. 15, a connectionprocedure for sending data from the DTE to the M-DTE under the controlof the H-PBX is described next. In this case, the IP packet istransmitted to the H-router no matter what network the DTE is visiting.Upon receipt of the packet from the DTE, the H-router converts the IPaddress to an incoming extension number using the conversion tablewithin the H-router and performs a communication by making an incomingcall from the TA to the M-DTE.

In case the M-DTE is under the control of the V-PBX, a communication isperformed by making an incoming call from the H-router to the M-DTE inaccording with a connection sequence of FIG. 16, using the loamingfunction of the H-PBX.

4: Other Embodiments

The present invention has been described in the form of one embodimentin which the invention is applied to an in-house communication systemhaving a wireless PBX system connected to the LAN. As a wireless accessmethod and a duplex method of the wireless PBX system, TDMA and TDD areemployed, respectively (reference documents: "Second Generation CordlessTelephone System, Standard Specifications, first issue (revision-1), RCRSTD-28", Old Juridical Foundation Wave System Development Center (NewName: Wave Industrial Society). In the alternative, other wirelessaccess methods such as CDMA, and other duplex method such as FDD may beemployed. Further, by connecting the PBX within the wireless PBX systemto other networks such as general public network (PSTN/ISDN), mobilenetwork (cellular network, public PHS network, radio paging, and thelike), connectionless type network, and the like, a communication can beperformed between a data communication terminal equipment under thecontrol of the network and a data communication terminal equipment underthe control of the wireless PBX system.

We claim:
 1. A mobile wireless data communications system comprising awireless personal station assigned with a telephone number in accordancewith a single telephone number scheme, a wireless connection equipmentfor performing a wireless connection with said wireless personalstation, an exchange for controlling said wireless connection equipment,a control unit connected to said exchange and adapted to perform atransmission control of packet data through said LAN, and a terminalequipment connected to said LAN and assigned with a packet addressindependent of said telephone number scheme; said exchange performing arouting based on the telephone number; said control unit performing atransmission control of the packet data based on the packet address;characterized in thatsaid exchange has a correspondence table in whichthe packet address is made correspond to the telephone number, and thepacket address is converted to the telephone number based on saidcorrespondence table in order to establish a communication channelbetween said wireless personal station and said terminal equipmentconnected to said LAN.
 2. A mobile wireless data communications systemcomprising a wireless personal station assigned with a telephone numberin accordance with a single telephone number scheme, a wirelessconnection equipment for performing a wireless connection with saidwireless personal station, an exchange for controlling said wirelessconnection equipment, a control unit connected to said exchange andadapted to perform a transmission control of packet data through saidLAN, and a terminal equipment connected to said LAN and assigned with apacket address independent of said telephone number scheme; saidexchange performing a routing based on the telephone number; saidcontrol unit performing a transmission control of the packet data basedon the packet address; characterized in thatsaid wireless personalstation has a correspondence table in which the packet address is madecorrespond to the telephone number, and converts the packet address tothe telephone number based on said correspondence table in order toestablish a communication channel between said wireless personal stationand said terminal equipment connected to said LAN.
 3. A mobile wirelessdata communications system comprising a wireless personal stationassigned with a telephone number in accordance with a single telephonenumber scheme, a wireless connection equipment for performing a wirelessconnection with said wireless personal station, an exchange forcontrolling said wireless connection equipment, a control unit connectedto said exchange and adapted to perform a transmission control of packetdata through said LAN, and a terminal equipment connected to said LANand assigned with a packet address independent of the telephone numberscheme; said exchange performing a routing based on said telephonenumber; said control unit performing a transmission control of thepacket data based on the packet address; characterized in thatsaidcontrol unit has a correspondence table in which the packet address ismade correspond to the telephone number, and converts the packet addressto the telephone number based on said correspondence table in order toestablish a communication channel between said wireless personal stationand said terminal equipment connected to said LAN.
 4. A mobile wirelessdata communications system comprising a plurality of systems eachcomprising a wireless personal station assigned with a telephone numberin accordance with a single telephone number scheme, a wirelessconnection equipment for performing a wireless connection with saidwireless personal station, an exchange for controlling said wirelessconnection equipment, a control unit connected to said exchange andadapted to perform a transmission control of packet data through saidLAN, and a terminal equipment connected to said LAN and assigned with apacket address independent of the telephone number scheme; said exchangeperforming a routing based on the telephone number; said control unitperforming a transmission control of the packet data based on the packetaddress; characterized in thatsaid exchanges of said systems areconnected together and said control units of said systems are alsoconnected together, said wireless personal station of each system iscapable of communicating with a control unit in a desired system througha wireless connection equipment and an exchange not only within its ownsystem but also within other system, and said exchange has acorrespondence table in which the packet address is made correspond tothe telephone number, and the packet address is converted to thetelephone number based on said correspondence table in order toestablish a communication channel between said wireless personal stationand said terminal equipment connected to said LAN.
 5. A mobile wirelessdata communications system comprising a plurality of systems eachcomprising a wireless personal station assigned with a telephone numberin accordance with a single telephone number scheme, a wirelessconnection equipment for performing a wireless connection with saidwireless personal station, an exchange for controlling said wirelessconnection equipment, a control unit connected to said exchange andadapted to perform a transmission control of packet data through saidLAN, and a terminal equipment connected to said LAN and assigned with apacket address independent of the telephone number scheme; said exchangeperforming a routing based on the telephone number; said control unitperforming a transmission control of the packet data based on the packetaddress; characterized in thatsaid exchanges of said systems areconnected together and said control units of said systems are alsoconnected together, said wireless personal station of each system iscapable of communicating with a control unit in a desired system througha wireless connection equipment and an exchange not only within its ownsystem but also within other system, and said wireless personal stationhas a correspondence table in which the packet address is madecorrespond to the telephone number, and converts the packet address tothe telephone number based on said correspondence table in order toestablish a communication channel between the wireless personal stationand said terminal equipment connected to said LAN.
 6. A mobile wirelessdata communications system comprising a plurality of systems eachcomprising a wireless personal station assigned with a telephone numberin accordance with a single telephone number scheme, a wirelessconnection equipment for performing a wireless connection with saidwireless personal station, an exchange for controlling said wirelessconnection equipment, a control unit connected to said exchange andadapted to perform a transmission control of packet data through saidLAN, and a terminal equipment connected to said LAN and assigned with apacket address independent of the telephone number scheme; said exchangeperforming a routing based on the telephone number; said control unitperforming a transmission control of the packet data based on the packetaddress; characterized in thatsaid exchanges of said systems areconnected together and said control units of said systems are alsoconnected together, said wireless personal station of each system iscapable of communicating with a control unit in a desired system througha wireless connection equipment and an exchange not only within its ownsystem but also within other system, and said control unit has acorrespondence table in which the packet address is made correspond tothe telephone number, and converts the packet address to the telephonenumber based on said correspondence table in order to establish acommunication channel between said wireless personal station and saidterminal equipment connected to said LAN.